Data flow - Process
Replication
Keeping copies of the same data or service in more than one place
What's it for?
Keeps copies of important data or services in more than one place so one failure does not lose everything.
For example…
A database replicates its records to another region so a recent copy is available if the primary region fails.
A read replica keeps a copy of the primary database so reporting queries can be served without loading the main transactional system.